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Orographic precipitation occurs when moist air is forced upwards over rising terrain and condenses on the slope, such as a mountain. Precipitation can fall in either liquid or solid phases, is mixed with both, or transition between them at the freezing level. Liquid forms of precipitation include rain and drizzle and dew.
Orographic precipitation is known to occur on oceanic islands, such as the Hawaiian Islands and New Zealand; much of the rainfall received on such islands is on the windward side, and the leeward side tends to be quite dry, almost desert-like. This phenomenon results in substantial local gradients in the amount of average rainfall, with coastal ...
Rain forests are characterized by high rainfall, with definitions setting minimum normal annual rainfall between 1,750 and 2,000 mm (69 and 79 in). [98] A tropical savanna is a grassland biome located in semi-arid to semi-humid climate regions of subtropical and tropical latitudes, with rainfall between 750 and 1,270 mm (30 and 50 in) a year.
Precipitation induced by orographic lift in Andalusia. Precipitation induced by orographic lift occurs in many places throughout the world. Examples include: The Mogollon Rim in central Arizona; The western slope of the Sierra Nevada range in California. The western slope of the Wasatch Range in Utah. Specifically the Little and Big Cottonwood ...
Orographic precipitation is precipitation created through the lifting action of air due to air masses moving over terrain such as mountains and hills, which is most common behind cold fronts that move into mountainous areas. It may sometimes occur in advance of warm fronts moving northward to the east of mountainous terrain.
The rising air cools and brings about orographic precipitation along the western coast. [12] This signifies the onset of the monsoon season in June. By the time the air rises above the mountains, it becomes dry, having brought heavy rainfall to the coast. [13] The region experiences a warm and humid tropical climate throughout the year. Mean ...
In some years, the rain quantity is sufficient but its timing arbitrary. Sometimes, despite average annual rainfall, the daily distribution or geographic distribution of the rain is substantially skewed. In the recent past, rainfall variability in short time periods (about a week) were attributed to desert dust over the Arabian Sea and Western ...
On July 1, 1977, the city of Karachi was flooded when 207 millimetres (8.1 in) of rain was recorded in 24 hours. [32] On July 23, 2001 620 millimetres (24 in) of rainfall was recorded in 10 hours in Islamabad. It was the heaviest rainfall in 24 hours in Islamabad and at any locality in Pakistan during the past 100 years. [33] [34] [35] [36]